# ionmetro — Professional Metronome

> Professional Metronome (iPhone/iPad app by Seth Adam Mundall.)

- Source: https://appshunter.io/ios/app/ionmetro/id6773792628 (this page in markdown: same URL + `.md`)
- Developer: [Seth Adam Mundall](https://appshunter.io/developer/1626079549)
- Category: Music, Utilities
- Price: Free (on sale, was $4.99)
- Age rating: 4+
- Requires: iOS 17.6 · 1 MB
- Languages: American English, Arabic, French (France), German (Germany), Japanese, Korean, Brazilian Portuguese, Russian, Chinese (Simplified, China), European Spanish
- Released: 2026-05-29
- Data updated: 2026-06-25
- User reviews in markdown: https://appshunter.io/ios/app/ionmetro/id6773792628/reviews.md

## What is ionmetro?

ionmetro is a precision metronome built for musicians who can't afford to be off the beat.

Most metronome apps use a software timer to schedule clicks. Timers get pushed around by UI animations, scrolling, and background activity — and the beat drifts. ionmetro uses a look-ahead audio scheduler: every click is placed at a sample-accurate position in the audio buffer, 100 ms ahead of playback. The result is a rock-solid beat you can actually practice to.

**Sample-accurate timing**
Clicks are scheduled at the audio buffer level, not the UI thread. The tempo never drifts, even with your screen locked or while using another app.

**Tap tempo**
Tap in time with a recording or a musician. ionmetro locks in from your most recent tap interval — no averaging lag, just instant feel.

**Time signatures**
2/4, 3/4, 4/4, and 6/8. The downbeat is always accented so you can feel the start of every bar.

**Subdivision**
Quarter notes, eighth notes, or triplets. Subdivision clicks are softer than the main beat so the pulse stays clear.

**Four sound presets**
Classic, Wood, Digital, and Soft — from bright and snappy to warm and muted.

**Plays in the background**
ionmetro keeps beating when you lock your screen or switch apps. Pair it with a sheet music reader, a tuner, or a recording app without losing the click.

**No friction**
No subscriptions. No ads. No accounts. Open it, set your tempo, press Start.


## Version history (last 1 release)

### 1.0 — 2026-05-29

No release notes.

## More apps by Seth Adam Mundall

- [Bible LSG](https://appshunter.io/ios/app/bible-lsg/id1626079547)
- [Hymnal Adventist](https://appshunter.io/ios/app/hymnal-adventist/id6446034427)
- [ionBible: Read, Study & Listen](https://appshunter.io/ios/app/ionbible-read-study-and-listen/id6447587266)
- [ionBible: KJV Study Bible](https://appshunter.io/ios/app/ionbible-kjv-study-bible/id6447638034)
- [Hymnal Adventist lite](https://appshunter.io/ios/app/hymnal-adventist-lite/id6447645698)
- [iontuner](https://appshunter.io/ios/app/iontuner/id6767259524)

All apps by Seth Adam Mundall: https://appshunter.io/developer/1626079549

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-25.*